<template>
    <div class="cmt-container">
        <h3>发表评论</h3>
        <hr>
        <textarea placeholder="请输入要BB的内容(最多吐槽120字)" maxlength="120" v-model="msg"></textarea>

        <mt-button type="primary" size="large" @click="postComment">发表评论</mt-button>

        <div class="cmt-list">
            <div class="cmt-item" v-for="(item, i) in comments" :key="item.add_time">
                <div class="cmt-title">
                    第{{ i+1 }}楼&nbsp;&nbsp;用户:{{ item.user_name }}&nbsp;&nbsp;发表时间: {{ item.add_time | dateFormat }}
                </div>
                <div class="cmt-body">{{ item.content? item.content: '此用户很懒, 啥也没说' }}</div>
            </div>
        </div>

        <mt-button type="danger" size="large" plain @click="getMore">加载更多</mt-button>
    </div>
</template>

<script>
import { Toast } from "mint-ui"
export default {
    data(){
        return {
            pageIndex: 1, 
            msg: '',  // 评论输入的内容
            comments: []  // 评论数组
        }
    },
    created(){
        this.getComments()
    },
    methods: {
        getComments(){
            this.$http.get('api/getcomments/' + this.id + '?pageindex=' + this.pageIndex).then(result => {
                if(result.body.status === 0) {
                    // 老数据拼接新数据
                    this.comments = this.comments.concat(result.body.message)
                } else {
                    Toast('获取评论失败!')
                }
            })
        }, 
        getMore(){
            this.pageIndex++;
            this.getComments()
        }, 
        postComment(){
            // 校验评论内容是否为空
            if(this.msg.trim().length === 0){
                return Toast('评论内容不能为空!')
            }

            // 参数1: 请求的URL地址
            // 参数2: 提交给服务器的数据对象 { content: this.msg }
            // 参数3: 定义提交时候, 表单中数据的格式 ( emulateJSON: true )
            this.$http.post('api/postcomment/' + this.$route.params.id, {content: this.msg.trim()}).then(result => {
                if (result.body.status ===0){
                    var cmt = { 
                        user_name: '匿名用户', 
                        add_time: Date.now(), 
                        content: this.msg.trim()
                    }
                }
                this.comments.unshift(cmt);
                this.msg = '';
            })
        }
    },
    props: ["id"],
}
</script>

<style lang="scss" scoped>
.cmt-container {
    h3 {
        font-size: 18px;
    }
    textarea {
        font-size: 14px;
        height: 85px;
        margin: 0;
    }
    .cmt-list {
        margin: 5px 0;
        .cmt-item{
            font-size: 13px;
            .cmt-title{
                line-height: 30px;
                background-color: #ccc;
            }
            .cmt-body{
                line-height: 35px;
                text-indent: 2em;
            }
        }
    }
}
</style>
